Fair Value Measurements (Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs) (Level 3) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		$ 804		$ 380
Included in earnings		(13)		91
Purchases/originations		54		(1)
Settlements		(17)		(35)
Transfers Into Level 3	[1]	3		3
Ending Balance		831		438
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2]	(20)		78
Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		143		167
Included in earnings		0		1
Purchases/originations		0		0
Settlements		(5)		(11)
Transfers Into Level 3	[1]	3		3
Ending Balance		141		160
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2]	0		1
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance	[3]	744
Included in earnings	[3]	(23)
Purchases/originations	[3]	55
Settlements	[3]	0
Transfers Into Level 3	[1],[3]	0
Ending Balance	[3]	776
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2],[3]	(23)
Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		8	[4]	12	[5]
Included in earnings		23	[4]	42	[5]
Purchases/originations		(1)	[4]	(1)	[5]
Settlements		(19)	[4]	(28)	[5]
Transfers Into Level 3	[1]	0	[4]	0	[5]
Ending Balance		11	[4]	25	[5]
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2]	16	[4]	29	[5]
Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		(91)	[4]	201	[5]
Included in earnings		(13)	[4]	48	[5]
Purchases/originations		0	[4]	0	[5]
Settlements		7	[4]	4	[5]
Transfers Into Level 3	[1]	0	[4]	0	[5]
Ending Balance		(97)	[4]	253	[5]
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2]	$ (13)	[4]	$ 48	[5]

[1] Includes certain residential mortgage loans originated as held for sale that were transferred to held for invest ment.

[2] Includes interest income and expense.

[3] Eff ective January 1, 2017, the Bancorp has elected the fair value measurement method for all existing classes of its residential mortgage servicing rights. The servicing r ights were measured at fair value at March 31, 2017 and were measured under the amortiza tion method at December 31, 2016.

[4] Net interest rate derivatives include derivative assets and liabilities of $ 16 and $ 5 , respectively , as of March 31, 2017 . Net equity derivatives include derivative assets and liabilities of $ 0 and $ 97 , respectively, as of March 31, 2017 .

[5] Net interest rate derivatives include derivative assets and liabilities of $ 29 and $ 4 , respectively, as of March 31, 2016 . Net equity derivatives include derivative assets and liabilities of $ 308 and $ 55 , respectively, as of March 31, 2016 .